SUS669

Stainless Steel

SUS669

JIS steel grade SUS669

Chemical Composition (%)

C0.08
CR20
NI17

Applications

Japanese Industrial Standard steel grade per JIS specification.

Available Forms

Bar, plate, sheet, tube, forgings, strip, wire

Uses

Austenitic stainless steel with excellent corrosion resistance, formability and weldability; non-magnetic in annealed condition. High nickel (≈19%) stabilises the austenite and improves toughness and pitting resistance. Used in food processing, chemical plant, architecture, heat exchangers, kitchenware and medical devices.

Heat Treatment

Solution anneal 1010–1150 °C followed by rapid water quench to retain austenite; not hardenable by heat treatment. Sensitization avoided by low carbon or stabilizers (Ti/Nb).

Precautions

Weld with low-carbon or stabilized filler (e.g., 316L, 347) to avoid sensitization; passivate after fabrication. Not hardenable, but work-hardens rapidly — use sharp tools and rigid setups. Avoid chloride contact for 304 in warm service; specify 316/317 for marine or aggressive media.

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